EN 61643的本部分适用于雷电或其他瞬态过电压间接和直接影响的浪涌保护装置。这些设备被包装成连接到50 Hz交流电源电路，设备额定电压高达1000 V r.m.s。性能特征、标准测试方法和额定值已建立。这些设备至少包含一个非线性组件，旨在限制浪涌电压和分流浪涌电流。

This part of EN 61643 is applicable to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages. These devices are packaged to be connected to 50 Hz a.c. power circuits, and equipment rated up to 1 000 V r.m.s. Performance characteristics, standard methods for testing and ratings are established. These devices contain at least one nonlinear component and are intended to limit surge voltages and divert surge currents.